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Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

I am new to this area , can you please share the complete command lines and also the trigger details

In order for anyone to do that you would need to share the details of what the tables look like and which columns need to get updated
and how they should get updated. If your dates are stored in a date field then they will take on what ever date format you are using in
your database/front end. You should also explain why you need to change semi colons to periods, and which columns in which tables
need to be updated. There should be plenty of code on how to write a before insert row by row trigger.